유연기판 태양전지가 설치된 온실 내의 광분포 분석 및 적상추의 생산

임은정,Seo Gyeong-Su,Hwang Inha,Shin Il-Kyung,오명민 한국원예학회 2024 원예과학기술지 Vol.42 No.2

최근 작물 재배면적 상부에 태양전지를 설치하여 잉여의 태양광을 에너지 발전에 사용하는 solar sharing 개념의 영농형 태양광발전 시스템이 주목을 받고 있다. 하지만 대부분의 적용은 노지재배이며 태양전지 설치를 위한 구조물에 따른 문제점이대두되면서 본 연구에서는 유연기판 태양전지를 활용하여 영농형 태양광발전 시스템을 시설원예로 적용하기 위해 재배실험을 수행하였다. 실험에는 적상추가 사용되었으며 태양전지가 온실 천장의 한 면에만 설치된 태양광Ⅰ, 두 면 모두에 설치된 태양광Ⅱ 그리고 설치되지 않은 대조구의 세 단동 아치형 비닐하우스에서 재배되었다. 또한 온실 내부 면적 전체의 광량 및 태양고도 변화에 따른 일중 변화를 위해 시뮬레이션상에 온실 조건을 구현하여 광추적 시뮬레이션을 수행하였다. 두 처리구 온실에서의 월별 발전량은 태양광Ⅰ, 태양광Ⅱ에서 각각 평균 156.85kWh, 323.34kWh였다. 태양전지에 의한 차광으로 인해 온실내부에서 측정된 DLI값은 대조구 대비 태양광Ⅰ에서 86%, 태양광Ⅱ는 71%를 보였으며, 동일한 조건에서 광추적 시뮬레이션 결과 DLI값은 측정값과 14.8µmol·m-2·day-1의 평균제곱근오차를 기록했다. 재배 결과 지상부생체중, 엽면적, SPAD, 안토시아닌 함량과 같은 전 항목에서 처리에 따른 통계적 유의성을 보이지는 않았다. 이를 통해 유연기판 태양전지가 설치된 온실에서의 상추과 같은 광요구도가 낮은 엽채류 생산이 가능함을 확인하였다. Recently, agrivoltaic systems, which utilize a solar-sharing conception by having solar cells installed on top of the cultivation area, using the extra solar light for photovoltaics, have been attracting attention. However, most applications are reported in open-field conditions, and some issues have been raised about the installation of these structures. Accordingly, we conducted a cultivation experiment in which an agrivoltaic system was applied to protected horticulture with flexible solar cells. Red leaf lettuce was used in the experiment and was cultivated in three single greenhouses with the system installed either on one side of the greenhouse ceiling, denoted as photovoltaic I, or on both sides denoted as photovoltaic Ⅱ. The control system used no agrivoltaic system. A ray-tracing simulation was also conducted to determine the light distribution of the total greenhouse floor area and daily difference according to solar altitude changes. It was found that the monthly amounts of energy generated in the greenhouses were 156.85 and 323.34 kWh for photovoltaic Ⅰ and photovoltaic Ⅱ, respectively. Due to the area shaded from light by the solar cells, daily light integral (DLI) values were 86% of the control for photovoltaic Ⅰ and 71% for photovoltaic Ⅱ. In the results of the ray-tracing simulation under identical conditions, the root mean square error between the calculated DLI and the measured DLI was 14.8 µmol·m-2·day-1. The shoot fresh weight, leaf area, SPAD and anthocyanin content of red leaf lettuces showed no significant differences according to the treatment. Through this study, it was confirmed that greenhouses with flexible solar cells can be applied for the production of leafy vegetable such as lettuce with low light saturation points.

Light Intensity and Lettuce Growth in an Apartment Balcony Affected by the Direction of Balcony

Yoonah Jang,Sun Jin Jeong,Kyeong Suk Han,Sang Mi Lee,Jung Nam Suh,Kwang Jin Kim 한국인간·식물·환경학회 2017 인간식물환경학회지 Vol.20 No.5

Light is very important for plant growth and a major limiting factor in indoor plant cultivation, such as in balconies. This study was conducted to investigate the light intensity and lettuce (Latuca sativa L.) growth in an apartment balcony affected by the direction of balcony. Photosynthetic photon flux (PPF), air temperature, and relative humidity in the east-, south-, or west-facing balcony were measured for a year. The lettuce was grown in the east-, south-, or west-facing balcony. The time and amount of light entering into the balcony differed according to the direction of the balcony window. Whereas light entered into the east-facing balcony from sunrise to noon, it entered into the west-facing balcony afternoon before sunset. The temperature and humidity in the balcony also varied according to the direction of the balcony window. Daily Light Integral (DLI) in the south-facing balcony was 20~50% of outdoor and DLI in east- or west-facing balconies was 10~20%. Also, the environmental characteristics of the balconies were affected seasonally. In the spring (from March to May), the DLI was around 10 mol・m-2・day-1 and the average temperature was around 25°C. But the DLI was below 10 mol・m-2・day-1 and the average temperature and relative humidity were around 30°C and over 60%, respectively, in the summer (from June to August). In the balcony, the average temperature was maintained around 10°C even in winter, which is a condition of freezing outdoor. Growth of the lettuce in the south-facing balcony was better than that of the other directions. This is attributed to better environmental conditions of south-facing balcony. Therefore, considering the environmental characteristics of the balcony, selection and management of crops with relatively low light demand like leafy vegetables are required. It is also recommended to cultivate crops from autumn to spring.

Light Intensity and Lettuce Growth in an Apartment Balcony Affected by the Direction of Balcony

장윤아,정순진,한경숙,이상미,서정남,김광진 인간식물환경학회 2017 인간식물환경학회지 Vol.20 No.5

Light is very important for plant growth and a major limiting factor in indoor plant cultivation, such as in balconies. This study was conducted to investigate the light intensity and lettuce (Latuca sativa L.) growth in an apartment balcony affected by the direction of balcony. Photosynthetic photon flux (PPF), air temperature, and relative humidity in the east-, south-, or west-facing balcony were measured for a year. The lettuce was grown in the east-, south-, or west-facing balcony. The time and amount of light entering into the balcony differed according to the direction of the balcony window. Whereas light entered into the east-facing balcony from sunrise to noon, it entered into the west-facing balcony afternoon before sunset. The temperature and humidity in the balcony also varied according to the direction of the balcony window. Daily Light Integral (DLI) in the south-facing balcony was 20~50% of outdoor and DLI in east- or west-facing balconies was 10~20%. Also, the environmental characteristics of the balconies were affected seasonally. In the spring (from March to May), the DLI was around 10 mol・m-2 ・day-1 and the average temperature was around 25°C. But the DLI was below 10 mol・m-2 ・day-1 and the average temperature and relative humidity were around 30°C and over 60%, respectively, in the summer (from June to August). In the balcony, the average temperature was maintained around 10°C even in winter, which is a condition of freezing outdoor. Growth of the lettuce in the south-facing balcony was better than that of the other directions. This is attributed to better environmental conditions of south-facing balcony. Therefore, considering the environmental characteristics of the balcony, selection and management of crops with relatively low light demand like leafy vegetables are required. It is also recommended to cultivate crops from autumn to spring.

Temperature and Light Intensity Induce Morphological and Anatomical Changes of Leaf Petiole and Lamina in Cyclamen persicum

Wook Oh,Ki Sun Kim 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.6

We report here the petiole elongation pattern and the morphological and anatomical changes of cyclamen leaf under different temperatures and light intensities to determine the cause of quality deterioration by over-expended petiole and leaf. ‘Metis Scarlet Red’ cyclamen plants with 5 fully unfolded leaves were grown under in three controlled environment chambers maintained at 16/12 (LT), 22/18 (MT), 28/24℃ (HT) (day/night), respectively. In each chamber, there were growth modules which provided three photosynthetic photon fluxes [PPF; 60 (LL), 120 (ML), 240 (HL) μmol · m?²?s?¹] at canopy height with 16 h (08:00-24:00) of photoperiod by fluorescent lamps. LL and HT promoted petiole elongation and leaf expansion mainly by cell elongation. The plants grown at HT had longer petioles even at relatively high PPF than those exposed to LT. Leaves at LL were larger and thinner in cross section than those at HL. Leaves at HL had long and well-developed palisade layers, whereas those at LL had only one short and poorly developed palisade layer. LL decreased stomatal density and number epidermal cells per unit area compared with HL.